"use client";

import { useState, useEffect, FormEvent } from "react";
import { useAuth } from "@/lib/AuthContext";
import { useRouter } from "next/navigation";
import {
  Wallet,
  Zap,
  Crown,
  TrendingUp,
  ArrowUpRight,
  ArrowDownLeft,
  Clock,
  Check,
  X,
  Loader2,
  Sparkles,
  Info,
} from "lucide-react";
import ErrorFeedback from "@/components/ErrorFeedback";

interface CashoutEntry {
  id: string;
  amountFlh: number;
  fiatAmount: number;
  status: string;
  createdAt: string;
}

const TOP_UP_OPTIONS = [
  { flh: 500, usd: 0.99, bonus: "", bestValue: false },
  { flh: 1000, usd: 0.99, bonus: "", bestValue: true },
  { flh: 5000, usd: 4.99, bonus: "+500 bonus", bestValue: false },
  { flh: 10000, usd: 9.99, bonus: "+2,000 bonus", bestValue: false },
  { flh: 50000, usd: 49.99, bonus: "+15,000 bonus", bestValue: false },
];

const EARNING_TIPS = [
  "Post in the forum — earn 50 FLH per approved post",
  "List items on Souq marketplace",
  "Complete daily AI coaching sessions",
  "Refer friends — earn 200 FLH per referral",
  "Participate in community challenges",
];

export default function WalletPage() {
  const { user, token, loading } = useAuth();
  const router = useRouter();

  const [balance, setBalance] = useState(0);
  const [cashoutHistory, setCashoutHistory] = useState<CashoutEntry[]>([]);
  const [cashoutAmount, setCashoutAmount] = useState("");
  const [cashoutLoading, setCashoutLoading] = useState(false);
  const [cashoutMessage, setCashoutMessage] = useState<{
    type: "success" | "error";
    text: string;
  } | null>(null);
  const [topupLoading, setTopupLoading] = useState<number | null>(null);
  const [topupSuccess, setTopupSuccess] = useState(false);

  useEffect(() => {
    if (!loading && !token) router.push("/auth");
  }, [loading, token, router]);

  useEffect(() => {
    if (token) {
      fetchWallet();
    }
  }, [token]);

  // Check for ?topup=success from Polar.sh or mock redirect
  useEffect(() => {
    const params = new URLSearchParams(window.location.search);
    if (params.get("topup") === "success") {
      setTopupSuccess(true);
      fetchWallet();
      // Clean URL param without reload
      const url = new URL(window.location.href);
      url.searchParams.delete("topup");
      window.history.replaceState({}, "", url.toString());
      const timer = setTimeout(() => setTopupSuccess(false), 6000);
      return () => clearTimeout(timer);
    }
  }, []);

  const fetchWallet = async () => {
    try {
      const res = await fetch("/mobile/api/wallet", {
        headers: { Authorization: `Bearer ${token}` },
      });
      if (res.ok) {
        const data = await res.json();
        setBalance(data.balance);
        setCashoutHistory(data.cashoutHistory || []);
      }
    } catch {
      // ignore
    }
  };

  const handleTopUp = async (amount: number) => {
    if (!token) return;
    setTopupLoading(amount);

    try {
      const res = await fetch("/mobile/api/wallet/top-up/create-checkout", {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
          Authorization: `Bearer ${token}`,
        },
        body: JSON.stringify({ amount }),
      });

      if (!res.ok) {
        const err = await res.json();
        throw new Error(err.error || "Top-up failed");
      }

      const data = await res.json();
      if (data.url) {
        router.push(data.url);
      }
    } catch (err: unknown) {
      const message =
        err instanceof Error ? err.message : "Top-up failed";
      setCashoutMessage({ type: "error", text: message });
      setTimeout(() => setCashoutMessage(null), 3000);
    } finally {
      setTopupLoading(null);
    }
  };

  const handleCashout = async (e: FormEvent) => {
    e.preventDefault();
    if (!token) return;

    const amountNum = parseInt(cashoutAmount, 10);
    if (isNaN(amountNum) || amountNum < 1000) {
      setCashoutMessage({
        type: "error",
        text: "Minimum cashout is 1,000 FLH",
      });
      setTimeout(() => setCashoutMessage(null), 3000);
      return;
    }

    if (amountNum > balance) {
      setCashoutMessage({
        type: "error",
        text: "Insufficient balance",
      });
      setTimeout(() => setCashoutMessage(null), 3000);
      return;
    }

    setCashoutLoading(true);
    setCashoutMessage(null);

    try {
      const res = await fetch("/mobile/api/wallet", {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
          Authorization: `Bearer ${token}`,
        },
        body: JSON.stringify({ amountFlh: amountNum }),
      });

      if (!res.ok) {
        const err = await res.json();
        throw new Error(err.error || "Cashout failed");
      }

      const data = await res.json();
      setCashoutMessage({
        type: "success",
        text: `Cashout request for ${data.cashout.amountFlh} FLH submitted!`,
      });
      setCashoutAmount("");
      await fetchWallet();
      setTimeout(() => setCashoutMessage(null), 4000);
    } catch (err: unknown) {
      const message =
        err instanceof Error ? err.message : "Cashout failed";
      setCashoutMessage({ type: "error", text: message });
      setTimeout(() => setCashoutMessage(null), 3000);
    } finally {
      setCashoutLoading(false);
    }
  };

  const isPremium = user?.isPremium || user?.isPro;

  if (loading) {
    return (
      <div className="min-h-dvh bg-[#0a0a0f] flex items-center justify-center">
        <div className="w-8 h-8 rounded-full border-2 border-[#D4AF37]/30 border-t-[#D4AF37] animate-spin" />
      </div>
    );
  }

  if (!user) return null;

  return (
    <div className="min-h-dvh bg-[#0a0a0f] pb-24">
      <div className="px-4 pt-6 pb-2">
        <h1 className="text-xl font-bold text-white">Wallet</h1>
      </div>

      <div className="px-4 space-y-5 animate-fade-in">
        {/* Balance Card */}
        <div className="bg-gradient-to-br from-[#D4AF37]/20 to-[#0a0a0f] border border-[#D4AF37]/30 rounded-2xl p-6 text-center">
          <div className="w-14 h-14 rounded-full bg-[#D4AF37]/20 flex items-center justify-center mx-auto mb-3">
            <Wallet size={24} className="text-[#D4AF37]" />
          </div>
          <p className="text-xs text-gray-500 uppercase tracking-wider mb-1">
            FLH Balance
          </p>
          <p className="text-4xl font-bold text-[#D4AF37]">
            {balance.toLocaleString()}
          </p>
          <p className="text-sm text-gray-500 mt-1">
            ≈ ${(balance / 1000).toFixed(2)} USD
          </p>

          {!isPremium && (
            <div className="mt-4 bg-[#D4AF37]/10 border border-[#D4AF37]/20 rounded-xl px-4 py-3">
              <div className="flex items-center justify-center gap-2">
                <Crown size={14} className="text-[#D4AF37]" />
                <p className="text-xs text-[#D4AF37] font-medium">
                  Premium members earn 2x FLH!
                </p>
              </div>
              <button
                onClick={() => router.push("/upgrade")}
                className="mt-2 text-xs text-[#D4AF37] underline underline-offset-2 py-1.5 px-2 -mx-2 rounded-lg"
              >
                Upgrade now
              </button>
            </div>
          )}
        </div>

        {/* Messages */}
        {cashoutMessage && cashoutMessage.type === "success" && (
          <div className="flex items-center gap-2 p-3 rounded-xl text-sm bg-emerald-900/20 border border-emerald-800/40 text-emerald-400">
            <Check size={16} />
            {cashoutMessage.text}
          </div>
        )}
        {cashoutMessage && cashoutMessage.type === "error" && (
          <ErrorFeedback error={cashoutMessage.text} kind="default" onRetry={() => setCashoutMessage(null)} context="wallet" />
        )}

        {/* Top-up Success Banner */}
        {topupSuccess && (
          <div className="flex items-center gap-2 p-3 rounded-xl text-sm bg-emerald-900/20 border border-emerald-800/40 text-emerald-400">
            <Check size={16} />
            Top-up successful! FLH has been added to your balance.
          </div>
        )}

        {/* Top-Up Section */}
        <div>
          <h2 className="text-sm font-semibold text-white mb-3 flex items-center gap-2">
            <Zap size={16} className="text-[#D4AF37]" />
            Top Up FLH
          </h2>
          <div className="grid grid-cols-3 gap-4">
            {TOP_UP_OPTIONS.map((opt) => (
              <button
                key={opt.flh}
                onClick={() => handleTopUp(opt.flh)}
                disabled={topupLoading === opt.flh}
                className="bg-[#111118] border border-gray-800/60 rounded-2xl p-4 text-center active:scale-95 transition hover:border-[#D4AF37]/30 disabled:opacity-60 relative"
              >
                {opt.bestValue && (
                  <span className="absolute -top-2.5 inset-x-0 mx-auto w-fit px-2 py-0.5 bg-[#D4AF37] text-[#0a0a0f] text-[10px] font-bold rounded-full uppercase tracking-wider">
                    Best Value
                  </span>
                )}
                {topupLoading === opt.flh ? (
                  <Loader2 size={20} className="animate-spin mx-auto text-[#D4AF37]" />
                ) : (
                  <>
                    <p className="text-lg font-bold text-white">
                      {opt.flh.toLocaleString()}
                    </p>
                    <p className="text-xs text-gray-500 mt-0.5">
                      ${opt.usd.toFixed(2)}
                    </p>
                    {opt.bonus && (
                      <p className="text-[11px] text-emerald-400 mt-1.5 font-semibold">
                        {opt.bonus}
                      </p>
                    )}
                  </>
                )}
              </button>
            ))}
          </div>
        </div>

        {/* Cashout Form */}
        <div className="bg-[#111118] border border-gray-800/60 rounded-2xl p-5">
          <h3 className="text-sm font-semibold text-white mb-3 flex items-center gap-2">
            <ArrowUpRight size={16} className="text-[#D4AF37]" />
            Cash Out FLH
          </h3>
          <p className="text-xs text-gray-500 mb-3">
            Convert your FLH to USD. Minimum 1,000 FLH (1,000 FLH = $1.00).
          </p>
          <form onSubmit={handleCashout} className="flex gap-3">
            <div className="flex-1">
              <input
                type="number"
                min={1000}
                step={100}
                value={cashoutAmount}
                onChange={(e) => setCashoutAmount(e.target.value)}
                placeholder="Amount FLH"
                className="w-full bg-[#1a1a24] border border-gray-800/60 rounded-xl px-4 py-4 text-white placeholder-gray-600 focus:outline-none focus:border-[#D4AF37]/50 focus:ring-1 focus:ring-[#D4AF37]/30 transition min-h-[48px]"
              />
            </div>
            <button
              type="submit"
              disabled={cashoutLoading}
              className="px-5 py-4 rounded-xl bg-[#D4AF37] text-[#0a0a0f] font-semibold text-sm disabled:opacity-50 active:opacity-80 transition flex items-center gap-2 min-h-[48px]"
            >
              {cashoutLoading ? (
                <Loader2 size={16} className="animate-spin" />
              ) : (
                "Cash Out"
              )}
            </button>
          </form>
          {cashoutAmount && parseInt(cashoutAmount) >= 1000 && (
            <p className="text-xs text-gray-500 mt-2">
              You will receive ~$
              {(parseInt(cashoutAmount) / 1000).toFixed(2)} USD
            </p>
          )}
        </div>

        {/* Transaction History */}
        <div>
          <h2 className="text-sm font-semibold text-white mb-3 flex items-center gap-2">
            <Clock size={16} className="text-gray-500" />
            Cashout History
          </h2>
          {cashoutHistory.length === 0 ? (
            <div className="bg-[#111118] border border-gray-800/60 rounded-2xl p-5 text-center">
              <TrendingUp size={20} className="mx-auto text-gray-700 mb-2" />
              <p className="text-sm text-gray-500">No cashouts yet</p>
              <p className="text-xs text-gray-700 mt-1">
                Your cashout requests will appear here
              </p>
            </div>
          ) : (
            <div className="space-y-2">
              {cashoutHistory.map((entry) => (
                <div
                  key={entry.id}
                  className="bg-[#111118] border border-gray-800/60 rounded-xl px-4 py-3 flex items-center justify-between"
                >
                  <div className="flex items-center gap-3">
                    <div
                      className={`w-8 h-8 rounded-full flex items-center justify-center ${
                        entry.status === "approved"
                          ? "bg-emerald-900/20"
                          : entry.status === "rejected"
                            ? "bg-red-900/20"
                            : "bg-amber-900/20"
                      }`}
                    >
                      {entry.status === "approved" ? (
                        <ArrowDownLeft
                          size={14}
                          className="text-emerald-400"
                        />
                      ) : entry.status === "rejected" ? (
                        <X size={14} className="text-red-400" />
                      ) : (
                        <Clock size={14} className="text-amber-400" />
                      )}
                    </div>
                    <div>
                      <p className="text-sm font-medium text-white">
                        {entry.amountFlh.toLocaleString()} FLH
                      </p>
                      <p className="text-xs text-gray-500">
                        ${entry.fiatAmount.toFixed(2)} —{" "}
                        {new Date(entry.createdAt).toLocaleDateString()}
                      </p>
                    </div>
                  </div>
                  <span
                    className={`text-xs font-medium capitalize ${
                      entry.status === "approved"
                        ? "text-emerald-400"
                        : entry.status === "rejected"
                          ? "text-red-400"
                          : "text-amber-400"
                    }`}
                  >
                    {entry.status}
                  </span>
                </div>
              ))}
            </div>
          )}
        </div>

        {/* Earning Tips */}
        <div className="bg-[#111118] border border-gray-800/60 rounded-2xl p-5">
          <h3 className="text-sm font-semibold text-white mb-3 flex items-center gap-2">
            <Sparkles size={16} className="text-[#D4AF37]" />
            Earn More FLH
          </h3>
          <ul className="space-y-2">
            {EARNING_TIPS.map((tip, i) => (
              <li key={i} className="flex items-start gap-3 text-sm text-gray-400">
                <Info size={16} className="text-[#D4AF37] mt-0.5 shrink-0" />
                <span>{tip}</span>
              </li>
            ))}
          </ul>
        </div>

        <div className="h-4" />
      </div>
    </div>
  );
}